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NVD / CVE Program· CNA Linux

CVE-2024-27437: vfio/pci: Disable auto-enable of exclusive INTx IRQ

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 139dfcc4d723ab13469881200c7d80f49d776060, 26389925d6c2126fb777821a0a983adca7ee6351, 2a4a666c45107206605b7b5bc20545f8aabc4fa2.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 139dfcc4d723ab13469881200c7d80f49d776060, 26389925d6c2126fb777821a0a983adca7ee6351, 2a4a666c45107206605b7b5bc20545f8aabc4fa2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

In the Linux kernel, the following vulnerability has been resolved: vfio/pci: Disable auto-enable of exclusive INTx IRQ Currently for devices requiring masking at the irqchip for INTx, ie. devices without DisINTx support, the IRQ is enabled in request_irq() and subsequently disabled as necessary to align with the masked status flag. This presents a window where the interrupt could fire between these events, resulting in the IRQ incrementing the disable depth twice. This would be unrecoverable for a user since the masked flag prevents nested enables through vfio. Instead, invert the logic using IRQF_NO_AUTOEN such that exclusive INTx is never auto-enabled, then unmask as required.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Apr 5, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 15th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • linux linux kernel3.6 and later · before 6.1.84
  • linux linux kernel6.2 and later · before 6.6.24
  • linux linux kernel6.7 and later · before 6.7.12
  • linux linux kernel6.8 and later · before 6.8.3
  • linux linux kernel6.8.4 and later · up to 6.8.12 inclusive

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.6affected
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 26389925d6c2126fb777821a0a983adca7ee6351affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 561d5e1998d58b54ce2bbbb3e843b669aa0b3db5affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before b7a2f0955ffceffadfe098b40b50307431f45438affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 139dfcc4d723ab13469881200c7d80f49d776060affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 2a4a666c45107206605b7b5bc20545f8aabc4fa2affected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before 3b3491ad0f80d913e7d255941d4470f4a4d9bfdaaffected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before bf0bc84a20e6109ab07d5dc072067bd01eb931ecaffected · git
    • 89e1f7d4c66d85f42c3d52ea3866eb10cadf6153 and later · before fe9a7082684eb059b925c535682e68c34d487d43affected · git
    • before 3.6not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.85-16.1.85-1
Debian:13linuxbefore 6.7.12-16.7.12-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-26810Apr 5, 2024 · vfio/pci: Lock external INTx masking ops
    31Monitor
  • ← EarlierCVE-2024-26812Apr 5, 2024 · vfio/pci: Create persistent INTx handler
    22Monitor
  • Later →CVE-2024-26811Apr 8, 2024 · ksmbd: validate payload size in ipc response
    22Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux139dfcc4d723ab13469881200c7d80f49d776060Vendor (CNA)
Linux Linux26389925d6c2126fb777821a0a983adca7ee6351Vendor (CNA)
Linux Linux2a4a666c45107206605b7b5bc20545f8aabc4fa2Vendor (CNA)
Linux Linux3b3491ad0f80d913e7d255941d4470f4a4d9bfdaVendor (CNA)
Linux Linux561d5e1998d58b54ce2bbbb3e843b669aa0b3db5Vendor (CNA)
Linux Linuxb7a2f0955ffceffadfe098b40b50307431f45438Vendor (CNA)
Linux Linuxbf0bc84a20e6109ab07d5dc072067bd01eb931ecVendor (CNA)
Linux Linuxfe9a7082684eb059b925c535682e68c34d487d43Vendor (CNA)
debian:linux6.1.85-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (9 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records